Physics
posted by Anonymous .
How much energy is stored in a 2.90cmdiameter, 14.0cmlong solenoid that has 200 turns of wire and carries a current of 0.790 ?

Compute the inductance L, in Henries.
The formula you need is here:
http://hyperphysics.phyastr.gsu.edu/hbase/electric/indsol.html
The stored energy is
E = (1/2) L I^2
E will be in Joules if I is in amperes.